1 /* $NetBSD: exec_ecoff.c,v 1.31 2014/03/07 01:34:29 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Adam Glass 5 * Copyright (c) 1993, 1994, 1996, 1999 Christopher G. Demetriou 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christopher G. Demetriou 19 * for the NetBSD Project. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: exec_ecoff.c,v 1.31 2014/03/07 01:34:29 christos Exp $"); 37 38 #ifdef _KERNEL_OPT 39 #include "opt_coredump.h" 40 #endif 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/proc.h> 45 #include <sys/vnode.h> 46 #include <sys/exec.h> 47 #include <sys/resourcevar.h> 48 #include <sys/module.h> 49 #include <sys/exec.h> 50 #include <sys/exec_ecoff.h> 51 52 #ifdef COREDUMP 53 #define DEP "coredump" 54 #else 55 #define DEP NULL 56 #endif 57 58 MODULE(MODULE_CLASS_EXEC, exec_ecoff, DEP) 59 60 static struct execsw exec_ecoff_execsw = { 61 .es_hdrsz = ECOFF_HDR_SIZE, 62 .es_makecmds = exec_ecoff_makecmds, 63 .u = { 64 .ecoff_probe_func = cpu_exec_ecoff_probe, 65 }, 66 .es_emul = &emul_netbsd, 67 .es_prio = EXECSW_PRIO_ANY, 68 .es_arglen = 0, 69 .es_copyargs = copyargs, 70 .es_setregs = cpu_exec_ecoff_setregs, 71 .es_coredump = coredump_netbsd, 72 .es_setup_stack = exec_setup_stack, 73 }; 74 75 static int 76 exec_ecoff_modcmd(modcmd_t cmd, void *arg) 77 { 78 switch (cmd) { 79 case MODULE_CMD_INIT: 80 return exec_add(&exec_ecoff_execsw, 1); 81 82 case MODULE_CMD_FINI: 83 return exec_remove(&exec_ecoff_execsw, 1); 84 85 default: 86 return ENOTTY; 87 } 88 } 89 90 /* 91 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. 92 * 93 * Given a proc pointer and an exec package pointer, see if the referent 94 * of the epp is in ecoff format. Check 'standard' magic numbers for 95 * this architecture. If that fails, return failure. 96 * 97 * This function is responsible for creating a set of vmcmds which can be 98 * used to build the process's vm space and inserting them into the exec 99 * package. 100 */ 101 int 102 exec_ecoff_makecmds(struct lwp *l, struct exec_package *epp) 103 { 104 int error; 105 struct ecoff_exechdr *execp = epp->ep_hdr; 106 107 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 108 return ENOEXEC; 109 110 if (ECOFF_BADMAG(execp)) 111 return ENOEXEC; 112 113 error = (*epp->ep_esch->u.ecoff_probe_func)(l, epp); 114 115 /* 116 * if there was an error or there are already vmcmds set up, 117 * we return. (the latter can happen if cpu_exec_ecoff_hook() 118 * recursively invokes check_exec() to handle loading of a 119 * dynamically linked binary's shared loader. 120 */ 121 if (error || epp->ep_vmcmds.evs_cnt) 122 return (error); 123 124 /* 125 * prepare the exec package to map the executable. 126 */ 127 switch (execp->a.magic) { 128 case ECOFF_OMAGIC: 129 error = exec_ecoff_prep_omagic(l, epp, epp->ep_hdr, 130 epp->ep_vp); 131 break; 132 case ECOFF_NMAGIC: 133 error = exec_ecoff_prep_nmagic(l, epp, epp->ep_hdr, 134 epp->ep_vp); 135 break; 136 case ECOFF_ZMAGIC: 137 error = exec_ecoff_prep_zmagic(l, epp, epp->ep_hdr, 138 epp->ep_vp); 139 break; 140 default: 141 return ENOEXEC; 142 } 143 144 /* set up the stack */ 145 if (!error) 146 error = (*epp->ep_esch->es_setup_stack)(l, epp); 147 148 if (error) 149 kill_vmcmds(&epp->ep_vmcmds); 150 151 return error; 152 } 153 154 /* 155 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 156 */ 157 int 158 exec_ecoff_prep_omagic(struct lwp *l, struct exec_package *epp, 159 struct ecoff_exechdr *execp, struct vnode *vp) 160 { 161 struct ecoff_aouthdr *eap = &execp->a; 162 163 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 164 epp->ep_tsize = eap->tsize; 165 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 166 epp->ep_dsize = eap->dsize + eap->bsize; 167 epp->ep_entry = eap->entry; 168 169 /* set up command for text and data segments */ 170 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 171 eap->tsize + eap->dsize, epp->ep_taddr, vp, 172 ECOFF_TXTOFF(execp), 173 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 174 175 /* set up command for bss segment */ 176 if (eap->bsize > 0) 177 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 178 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 179 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 180 181 return 0; 182 } 183 184 /* 185 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 186 * package. 187 */ 188 int 189 exec_ecoff_prep_nmagic(struct lwp *l, struct exec_package *epp, 190 struct ecoff_exechdr *execp, struct vnode *vp) 191 { 192 struct ecoff_aouthdr *eap = &execp->a; 193 194 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 195 epp->ep_tsize = eap->tsize; 196 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); 197 epp->ep_dsize = eap->dsize + eap->bsize; 198 epp->ep_entry = eap->entry; 199 200 /* set up command for text segment */ 201 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 202 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 203 VM_PROT_READ|VM_PROT_EXECUTE); 204 205 /* set up command for data segment */ 206 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 207 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 208 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 209 210 /* set up command for bss segment */ 211 if (eap->bsize > 0) 212 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 213 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 214 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 215 216 return 0; 217 } 218 219 /* 220 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 221 * 222 * First, set the various offsets/lengths in the exec package. 223 * 224 * Then, mark the text image busy (so it can be demand paged) or error 225 * out if this is not possible. Finally, set up vmcmds for the 226 * text, data, bss, and stack segments. 227 */ 228 int 229 exec_ecoff_prep_zmagic(struct lwp *l, struct exec_package *epp, 230 struct ecoff_exechdr *execp, struct vnode *vp) 231 { 232 struct ecoff_aouthdr *eap = &execp->a; 233 int error; 234 235 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 236 epp->ep_tsize = eap->tsize; 237 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 238 epp->ep_dsize = eap->dsize + eap->bsize; 239 epp->ep_entry = eap->entry; 240 241 error = vn_marktext(vp); 242 if (error) 243 return (error); 244 245 /* set up command for text segment */ 246 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, 247 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 248 VM_PROT_READ|VM_PROT_EXECUTE); 249 250 /* set up command for data segment */ 251 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize, 252 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 253 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 254 255 /* set up command for bss segment */ 256 if (eap->bsize > 0) 257 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 258 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 259 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 260 261 return 0; 262 } 263